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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59a5d190a0ed6ed97907835dbd0be5060ff9c754a497c32c4461523e1ca3d68' 
  AND token = 'OzH+scI0hE+i1VdtUj7jw19zBiKsD3YJiGB3pALTI6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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