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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edce8f50d2a7cd2ed7c73db7e8721d46de27b6fba6d2f4d6e1c1b54a51a5230' 
  AND token = 'GGgbR5GrI5Dl4Co1KMyW6tWJ39gf2Q8C/Y/U5jliB1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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