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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abada29a4b84f02098de7939779ade230c2ba7d166e8830e5f21138d2cabd62' 
  AND token = 'XAWMKQWwPhFFO9+z8EYFZjlgzr2S+WbCZFaCBysrZ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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