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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec1e603b745ed4a2937ab20bf359852a32af889a655f2bba93826848a7f6693' 
  AND token = '9IO2GsTbXb1Y7y+2e5gFxLVBE/spMd8K1dKuD82Dz/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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