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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bfd160e64d53281fe0e3a0e58340d8160970f7e683371758db5d77020fb09e' 
  AND token = 'PQP9PLIjyD14Xh5g3mDhwF7aMM7Djb9KbNsFvPt35Iw=' 
  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"
    }
  }
}