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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196664e2a8e04e6d15547d686af389dd796c38cc1c9423dec89c77a23bd0c16d' 
  AND token = 'VN8p0Cw9FjhlyBHaP2AlFb0J6LJpOWKj2q5oOKs2sMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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