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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7c3966bdd4d1127125da56a76f7131b3aaa66f9813e226663de00522963964' 
  AND token = 'SeeRS3UwdLg9JLIkRGp1T7s9o3REw3d9vMbPUgRBf0o=' 
  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"
    }
  }
}