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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7409574ce95f949d5c5bd74a80f6be97b262b6e5f84468d03d82a940bba2ba' 
  AND token = '3kKEHUx7JqVyLQAA81EdTHid+CZooh9yS18amyS6h6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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