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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e27678463f05cdf60076ca8646d842d5641b3e9bb08e1d452d7fd184248adc' 
  AND token = 'RXvQW3Ni8J81Odk/PrcnDG525ksxK4Ohs0R+6tdrM+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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