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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47d89f9202ab2a0d72b49deb241009d830f525b192afe5e95c6932c92540873' 
  AND token = 'kHjQ/Lo2e/VVHJJet2i5yttclmS5BptyCIpUzAcBvmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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