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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec93b6421d7828feed9b293c5dc3516dd9cab62212085267e8baf4a2ffc1e4e6' 
  AND token = 'QDVLR3rRcMqeV5Q2qsVE1mp2gsTH6zBFGYCIOFSCLh0=' 
  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"
    }
  }
}