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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c06e05d429d2aefa8d14ef24c5728ae42f081a375942cb30cf188d9f30907e' 
  AND token = 'y7701zcqlVRIKlvJn+Vp1cN9lZi5KDLCsQDm6+806g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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