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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c169841d1763de0cfb4ba628a2b7226cc0bb31ba68520c0c3b354374dd8ca27b' 
  AND token = 'o8at/GHzvhv8/5Dgy0CXAB6U1nF61rn7zITcevMDNt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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