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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e650062ab1a283a83ba1c10cc4289e47ab8965214b1123de3d631fbeef9ba918' 
  AND token = '0JURxCTLuS6O0CJFGsjTy50dhxDDjcEUv4MvYZ8Pg6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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