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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b112226f90926e90a6667875ab5e01c0ad5195c16d9cef1e907cf0a3abce7f70' 
  AND token = '6lTLmceDLbGPekjv6x17Lfo994a5cqYe9n97Lvalyhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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