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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f866d3bb2395ab0a0f1751bb43a0b6c941ab5737d58e5bdfea301940703bc1' 
  AND token = 'KErA9J5q7sDaM+d7laYJPOBCGJ0h4W6v3NuN5Dn7wII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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