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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdef5d991f022218eff003ae47cc7c546d2f93513bb71c34fd61af6ec7db4f32' 
  AND token = 'q/H3GAktv9GiVBP7ppc7rAQt/Qvl0uL+Cn9axFAru2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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