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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab5b7f8fd6d336a7e536df90a30b09034472ffd101a93f0d4fcb815db6b3b9b' 
  AND token = 'yUajkPIfe58WErWP3ivnvbT0qVMaU4VBgVbhTWCtABo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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