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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cea2e90db0798c923fcbc7ef87b3c8d5e6e8c8fbc3df5abf533f23b5d476cb' 
  AND token = 'trqp6KiIcD8L5vrxvVBfrIA4f7CY+VEN/1SbvGLU3Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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