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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c411a47fe638a00a1e3647cb3a7679a5b2f05bb7d8b597afda09cdc7b0b546c2' 
  AND token = 'u4h4zd8znjBNP9azODSopxYkdRJ4F8n/0eOWwYtED/c=' 
  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"
    }
  }
}