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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42037cce51d104c6228f45ed849669e6fbe6e970edea8856bdd68e9d702d8e53' 
  AND token = '8yI1W/eSejW2vV/f5qM3plLIe3ZbT7jOStgMT1QO/Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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