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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fc79ace582861ea7477c3949f87bcf4933b724a467aa8dc3a2f6b73de5aaca' 
  AND token = '6/uc/ulk9Ld1JUQj9COl5vtxhhjapRSxfVzMTLPR7SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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