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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b0c631b1eb6cef34cfc394540e792e6f0275c515868ab10d2674c2465916e3' 
  AND token = 'dEZXADBvS55/recF05tXz1txaubiF3RwT0uVBaQNO4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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