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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1799b26c5d065b756ae8c739a0369d8c09e176abca11d2bd24c007ed1daffc0' 
  AND token = '9w1tk0xPqvQ1BE6z7qIRkuHMnAAV5r8y9Fu+mTW+3lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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