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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f732b36db2d50475514b332212d5d6b491d9a70e0e7029c265d0229e0a41150c' 
  AND token = '2cLGeZ/LG3OdrX65mfEDWputzvjE4q7RzPJYHDu8cig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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