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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7e35a0888c01af5dfa38ca3f55f9160f2f5f39e79807488d40e81247589498' 
  AND token = 'ZiGGPXojSitYxByD8QlXS8hS90LnbBBdVWaf2solcHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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