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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bc4cade4885fca0108e928fccdfd695a09bc726eb7c43e86f700864fce47a2' 
  AND token = '/nlERkU8O4HZyVrPCKMYLQsVwc3rNL4k2SNZQ4dHB+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}