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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29677c756cdecaff08a811342b886a341cef0a1f065ab77fcb625ca77b8ccfa' 
  AND token = '1o8oC6h4r+nfr+/m2b3RCkbVyFac/fj2lAIkMVtxLBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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