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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20628e270e54375524164e2ff2f7c2c6566f627eda9991400dd1c406e4fc6d5' 
  AND token = 'zLUcmavn0vyClLaMqq6rBvGeITATT3QaBCcQLGMqcAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00147

JSON explain

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