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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3e3b7bf41cf2088b2fe2e6e31f594f5b7f3144706bd7ff7daf89ff0fda617f' 
  AND token = 'Ru8LDZ6z72YiSpGsywwABpoHe/fIdEcXzUPslG5SfiQ=' 
  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"
    }
  }
}