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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f662574a150ffa134b339dd1927a9a11585ca6f24397b81d1d7876a9fe5dca' 
  AND token = 'v6OPkcsk/o+vJK4MEzv62cv0kdVXrn4vgq1t4Jvd/7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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