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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8606ae9451e5db513b27da85a20922d5bdadcc9f3a5665c1b447bc19f1ad70b9' 
  AND token = 'n7XzWeq9kr++3OfCs0k3VWH1I1vmYUfKoik3qikVaGk=' 
  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"
    }
  }
}