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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8387c4a667d877ffd92da8e1f4dbbdb63c0cecafab0fa53f98274ccd32783776' 
  AND token = '6brINo0xVh/nI8XZ2wuQF1HPDz8zIFYN5JRfdVBNZ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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