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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e6876e1b062c9d1f061254601da64a2ee09ede43a69e10a73c8c0b982aa686' 
  AND token = 'Ap8r0/N2e9eQ/e7S2sXv2CNCXuXiDQGArXK1sdMCCRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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